local fio = require('fio')
local t = require('luatest')
local helpers = require('test.helper')
local g = t.group('expirationd_reload')
local is_cartridge_helpers, cartridge_helpers = pcall(require, 'cartridge.test-helpers')

g.before_all(function(cg)
    if is_cartridge_helpers then
        local entrypoint_path = fio.pathjoin(helpers.project_root,
                                             'test',
                                             'entrypoint',
                                             'srv_reload.lua')
        cg.cluster = cartridge_helpers.Cluster:new({
            datadir = fio.tempdir(),
            server_command = entrypoint_path,
            use_vshard = true,
            replicasets = {
                {
                    uuid = helpers.uuid('a'),
                    alias = 'router',
                    roles = { 'vshard-router' },
                    servers = {
                        { instance_uuid = helpers.uuid('a', 1), alias = 'router' },
                    },
                },
                {
                    uuid = helpers.uuid('b'),
                    alias = 's-1',
                    roles = { 'vshard-storage', 'customers-storage' },
                    servers = {
                        { instance_uuid = helpers.uuid('b', 1), alias = 's1-master' },
                    }
                }
            },
        })
        cg.cluster:start()
    end
end)

g.after_all(function(cg)
    if is_cartridge_helpers then
        cg.cluster:stop()
        fio.rmtree(cg.cluster.datadir)
    end
end)

g.before_each(function()
    t.skip_if(not is_cartridge_helpers, "cartridge is not installed")
end)

g.after_each(function()
    g.cluster:server('s1-master').net_box:eval([[
        box.space.customers:truncate()
    ]])
end)

local function reload_roles(srv)
    local ok, err = srv.net_box:eval([[
        return require('cartridge.roles').reload()
    ]])

    t.assert_equals({ok, err}, {true, nil})
end

local walk_task_name = "walk_all"
local task_sleep_on_10_eval = string.format([[
    local expirationd = require('expirationd')
    local fiber = require("fiber")
    local helpers = require("test.helper")

    for i = 1,100 do
        box.space.customers:insert({i})
    end

    local tuples_cnt = 0
    local is_expired_sleep = function()
        tuples_cnt = tuples_cnt + 1
        if tuples_cnt == 10 then
            fiber.sleep(60)
        end
        return true
    end
    task = expirationd.start("%s", box.space.customers.id, is_expired_sleep,
                             {process_expired_tuple = function() return true end,
                              force = true})

    helpers.retrying({}, function()
        if tuples_cnt < 10 then
            error("the task do not reach a target tuple")
        end
    end)
]], walk_task_name)

local task_first_tuple_eval = string.format([[
    local expirationd = require('expirationd')
    local helpers = require("test.helper")

    local tuple = nil
    local is_expired_tuple = function(arg, t)
        if tuple == nil then
            tuple = t
        end
        return true
    end
    task = expirationd.start("%s", box.space.customers.id, is_expired_tuple,
                             {force = true})

    helpers.retrying({}, function()
        if tuple == nil then
            error("the task is not started")
        end
    end)

    task:kill()

    return tuple or {}
]], walk_task_name)

function g.test_task_continue_after_reload(cg)
    local ok = cg.cluster:server('s1-master').net_box:eval(task_sleep_on_10_eval .. [[
        return true
    ]])
    t.assert_equals(ok, true)

    reload_roles(cg.cluster:server('s1-master'))

    local tuple = cg.cluster:server('s1-master').net_box:eval(task_first_tuple_eval)
    t.assert_equals(tuple, {10})
end

function g.test_task_continue_after_stop_and_reload(cg)
    local ok = cg.cluster:server('s1-master').net_box:eval(task_sleep_on_10_eval .. [[
        task:stop()
        return true
    ]])
    t.assert_equals(ok, true)

    reload_roles(cg.cluster:server('s1-master'))

    local tuple = cg.cluster:server('s1-master').net_box:eval(task_first_tuple_eval)
    t.assert_equals(tuple, {10})
end

function g.test_task_not_continue_after_kill_and_reload(cg)
    local ok = cg.cluster:server('s1-master').net_box:eval(task_sleep_on_10_eval .. [[
        task:kill()
        return true
    ]])
    t.assert_equals(ok, true)

    reload_roles(cg.cluster:server('s1-master'))

    local tuple = cg.cluster:server('s1-master').net_box:eval(task_first_tuple_eval)
    t.assert_equals(tuple, {1})
end

function g.test_cfg_metrics_disable_after_reload(cg)
    t.skip_if(not helpers.is_metrics_supported(),
              "metrics >= 0.11.0 is not installed")

    cg.cluster:server('router').net_box:eval([[
        local expirationd = require('expirationd')
        expirationd.cfg({metrics = false})
    ]])

    reload_roles(cg.cluster:server('router'))

    local ret = cg.cluster:server('router').net_box:eval([[
        return require('expirationd').cfg.metrics
    ]])
    t.assert_equals(ret, false)
end

function g.test_cfg_metrics_enable_after_reload(cg)
    t.skip_if(not helpers.is_metrics_supported(),
              "metrics >= 0.11.0 is not installed")

    cg.cluster:server('router').net_box:eval([[
        local expirationd = require('expirationd')
        expirationd.cfg({metrics = true})
    ]])

    reload_roles(cg.cluster:server('router'))

    local ret = cg.cluster:server('router').net_box:eval([[
        return require('expirationd').cfg.metrics
    ]])
    t.assert_equals(ret, true)
end

function g.test_cfg_metrics_clean_after_reload(cg)
    t.skip_if(not helpers.is_metrics_supported(),
              "metrics >= 0.11.0 is not installed")

    local metrics = cg.cluster:server('s1-master').net_box:eval([[
        local metrics = require('metrics')
        local expirationd = require('expirationd')

        expirationd.cfg({metrics = true})
        expirationd.start("stats_basic", 'customers',
                          function()
                              return true
                          end)
        metrics.invoke_callbacks()
        return metrics.collect()
    ]])
    local restarts = nil
    for _, v in ipairs(metrics) do
        if v.metric_name == "expirationd_restarts" then
            restarts = v.value
        end
    end
    t.assert_equals(restarts, 1)

    reload_roles(cg.cluster:server('s1-master'))

    local metrics = cg.cluster:server('s1-master').net_box:eval([[
        local metrics = require('metrics')
        local expirationd = require('expirationd')

        metrics.invoke_callbacks()
        return metrics.collect()
    ]])
    t.assert_equals(metrics, {})
end
